How about a map which has portals to the nether and the ender. In nether we are inside a volcano as suggested by SmashMaster and in ender we are inside a weird ender castle? And in the normal world u would be inside the white house and in the enterance there would be 2 portals 1 for nether other for ender, but they both would be opposite ... like the nether portal would seem as if it is the ender portal and vice versa. We would start of all play starting at the nether volcano or the white house. If u can, do 12 players start in the white house and 12 people start at the volcano, or if u wanna make it a 48 players..... Also at the peak of the nether volcano ( the opening) there would be 2 portals 1 of ender 1 of earth(the normal land) and this time they would not be switched(reverse psychology) and do anything u like of the ender. And in death match u can make 3 ufos with connecting glass to each other and a platform in the middle so a triangle would be made and in between (the middle) of each glass connecting to the other persons territory would be a glass connection with the platform in between so 3 ufos making a triangle and in between the triangle a small platform.